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package com.example.administrator.third;
import android.app.Activity;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.view.View;
import android.widget.Button;
public class MainActivity extends Activity {//AppCompat
Button btn;
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.main);
btn = (Button)findViewById(R.id.button);
btn.setOnClickListener(new MyOnClickListener() );
}
}
class MyOnClickListener implements View.OnClickListener
{
StringBuffer str;
boolean b;
MyOnClickListener()
{
b =true;
str = new StringBuffer();
}
public void onClick(View var1)
{
if(b==true)
{
str.append("+");
if(str.length()>=10)
b=false;
}
else if(b==false)
{
str.deleteCharAt( str.length()-1);
if(str.length()==1)
b=true;
}
// str.append("+");
System.out.println("我被单击了" + str.toString() + " " + str.length());
}
}